[GCM] Fix gcm network change handling before connect

[GCM] Fix gcm network change handling before connect

We were listening to network events and trying to reconnect before even
being told to do the first connection. Until Connect() has been called,
SignalConnectionReset should have no effect.

BUG=440455
Committed: https://crrev.com/e0b18536e2f4f879545c688821ba378bc64ccd76
Cr-Commit-Position: refs/heads/master@{#307965}

[Nicolas Zea, 2014-12-11 00:08:50]

zea@chromium.org changed reviewers:
+ jianli@chromium.org

[Nicolas Zea, 2014-12-11 00:08:51]

+Jian, PTAL

[jianli, 2014-12-11 00:27:57]

lgtm

[Nicolas Zea, 2014-12-11 00:28:53]

The CQ bit was checked by zea@chromium.org

[commit-bot: I haz the power, 2014-12-11 00:31:40]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/793883003/40001

[commit-bot: I haz the power, 2014-12-11 03:17:27]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-12-11 03:17:28]

Try jobs failed on following builders:
  linux_chromium_asan_rel on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[Nicolas Zea, 2014-12-11 19:46:23]

The CQ bit was checked by zea@chromium.org

[commit-bot: I haz the power, 2014-12-11 19:48:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/793883003/60001

[commit-bot: I haz the power, 2014-12-11 20:44:52]

Committed patchset #4 (id:60001)

[commit-bot: I haz the power, 2014-12-11 20:46:28]

Patchset 4 (id:??) landed as
https://crrev.com/e0b18536e2f4f879545c688821ba378bc64ccd76
Cr-Commit-Position: refs/heads/master@{#307965}